Optimized aerodynamic profile for a turbine vane, in particular for a nozzle of the third stage of a turbine

ABSTRACT

When cold and in the non-coated state, the aerodynamic profile is substantially identical to a nominal profile determined by the Cartesian coordinates X,Y, Zadim given in Table 1, in which the coordinate Zadim is the quotient D/H where D is the distance of the point under consideration from a first reference plane P0 situated at the base of the nominal profile, and H is the height of said profile measured from the first reference plane to a second reference plane P1. The measurements D and H are taken radially relative to the axis of the turbine, while the X coordinate is measured in the axial direction of the turbine.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This patent application claims the benefit under 35 U.S.C. § 119 to U.S. Provisional Application No. 62/361,550, filed on Jul. 13, 2016, the entirety of which is incorporated herein by reference.

FIELD OF THE DISCLOSURE

The present invention relates to an aerodynamic profile for a turbine vane.

INTRODUCTION

In particular, the invention relates to the aerodynamic profile of a nozzle vane forming a portion of the stator of a gas turbine, and more particularly of a low pressure turbine of the type used in a turbojet of an aircraft.

The invention relates in particular to a nozzle vane of the third stage of a turbine having a plurality of stages, preferably seven stages.

Such a profile should enable the turbine to provide the desired efficiency, and in order to do that it must be such that the flow of air around the profile is sound over the working spectrum of the turbine, i.e. substantially such that it does not give rise to turbulence, which is harmful for overall efficiency.

It must be capable of being installed properly in the environment of the engine, and in particular, for a nozzle vane forming a portion of the stator of the turbine, it must be capable of being fastened easily to the sectors of the foot platform (the zone of the vane that is furthest from the axis of rotation of the turbine) and of the head platform (the zone that is closest to said axis). Furthermore, this part must present a profile enabling it to be manufactured in a reliable and cost-effective manner by available manufacturing methods, such as casting, forging, machining, additive fabrication, or else weaving, without this list being limitative.

Furthermore, the profile of the vane must enable it to withstand the mechanical stresses, to which the vane is subjected, by enabling those stresses to be spread over the entire vane in such a manner as to avoid premature wear thereof. This spreading must apply both in static mode and in dynamic mode.

An object of the invention is to propose an aerodynamic profile for a turbine vane that is optimized, and capable of satisfying those objectives.

This object is achieved by the fact that when cold and in a non-coated state, said profile is substantially identical to a nominal profile determined by the Cartesian coordinates X,Y,Zadim given in Table 1, in which the coordinate Zadim is the quotient D/H where D is the distance of the point P under consideration from a reference X,Y plane situated at the base of the nominal profile, and H is the height of said profile measured from said reference plane that is the intersection of the stacking axis of the set of vanes and the axisymmetric surface of the hub, out to a second reference plane that is the intersection of said stacking axis with the axisymmetric surface of the casing, the measurements D and H being taken radially relative to the axis of the turbine, while the coordinate X is measured in the axial direction of the turbine.

This profile has been determined as a result of numerous tests and simulations. It is defined cold, i.e. at an ambient temperature of 20° C. That is a reference temperature at which the profile is geometrically determined. The above-mentioned objectives of aerodynamics and mechanical optimization are naturally valid for the conditions of use of this aerodynamic profile, i.e. when hot, at a temperature that is stabilized when the engine of which the turbine forms a part is being used under cruising conditions.

Furthermore, the aerodynamic profile of the invention is defined in the non-coated state. Since turbine vanes are subjected to high temperature gradients, it is common practice for them to be provided with a coating having thermal properties enabling them more easily to withstand such temperature variations. The profile is determined prior to installing such a coating.

It is stated above that the profile of the invention is “substantially identical” to the nominal profile. This means that the profile may depart very slightly from said nominal profile.

The aerodynamic profile is thus preferably defined within an envelope of ±1 millimeter (mm) in a direction normal to the surface of the nominal profile.

This variation takes account in particular of manufacturing tolerances of the profile.

It is also preferable for the X,Y coordinates of the aerodynamic profile to lie within a range of ±5% relative to the X,Y coordinates of the nominal profile.

This variation takes account of the setting of the profile to adapt to the flow coming from the blades of the turbine situated upstream, so as to further improve the efficiency of the turbine. In particular, the profile is adapted so as to be optimized for the flow coming from the rotary wheel of the second stage of a turbine when the vane of the invention belongs to the nozzle of the third stage of a turbine.

With a nozzle vane, i.e. a portion of the stator of a turbine, the profile serves to orient the fluid correctly for the turbine blades that are situated downstream, and that belong in particular to the rotary wheel of the third stage of the turbine.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention can be better understood and its advantages appear better on reading the following detailed description of an embodiment given by way of non-limiting example. The description refers to the accompanying drawings, in which:

FIG. 1 is a fragmentary axial section view of a turbine including a vane of profile that corresponds to that of the invention;

FIG. 2 is an enlarged view of FIG. 1, showing the third stage of the turbine.

DETAILED DESCRIPTION

The turbine shown in axial section in FIG. 1 comprises seven stages referenced respectively S1 to S7. In the direction DF going from upstream to downstream, each stage comprises a nozzle that forms a portion of the stator of the turbine and that has a plurality of radially-oriented vanes, and a rotary wheel that forms a portion of the rotor of the turbine and that likewise includes a plurality of radially-oriented blades.

In FIG. 1, the vanes of the nozzles of stages S1 to S7 are given references N1 to N7, whereas the blades of rotary wheels of stages S1 to S7 are given respective references W1 to W7.

In known manner, the vanes of the nozzles are fastened at both ends to stationary structure portions, while the blades of the rotary wheels are fastened to a rotary disk via their roots that are formed at their radially-inner ends closer to the axis of the rotation A of the turbine. The disks d1 to d7 forming parts of the wheels W1 to W7 are constrained to rotate together.

The invention relates in particular to a vane N3 which is a vane of the nozzle of the third stage S3 of the turbine that, as mentioned above, preferably comprises seven stages as shown, without this number being limiting.

As best seen in FIG. 2, via its foot 10, which is its end remote from the axis of rotation A, the vane N3 is fastened to the outer ring 12 of the turbine, which ring is stationary in rotation. Via its head 14, formed by its end closer to the axis of rotation A, the vane is fastened to an inner shroud 16 of the turbine. By convention, the aerodynamic profile 18 of the vane is the entire portion of said vane that extends radially outwards from its head 14 to its foot 10 without incorporating the fastenings respectively to the outer ring 12 and to the inner shroud 16.

In FIG. 2, there can be seen a frame of reference comprising Cartesian coordinates X,Y,Z. The radial direction Z is the height direction of the vane, which extends radially from its head to its foot. This direction Z is perpendicular to the axial direction X which is the direction of the axis of rotation A of the turbine. The direction Y is perpendicular to the X,Z plane and is therefore tangential to the direction of rotation of the turbine.

The nominal profile from which the aerodynamic profile of the invention is determined is defined in following Table 1 of coordinates, in which the coordinate Zadim, measured along the axis Z is non-dimensional, whereas the dimensions X and Y, respectively measured along the axes X and Y, are expressed in millimeters.

TABLE 1 X Y Zadim −6.04024 −0.8485 −0.17699 −6.08596 −0.88175 −0.17699 −6.14277 −0.94109 −0.17699 −6.2014 −1.05354 −0.17699 −6.2252 −1.22861 −0.17699 −6.18793 −1.45632 −0.17699 −6.08271 −1.72447 −0.17699 −5.90833 −2.02526 −0.17699 −5.66284 −2.35213 −0.17699 −5.34406 −2.69821 −0.17699 −4.94954 −3.05531 −0.17699 −4.47686 −3.41324 −0.17699 −3.92373 −3.75872 −0.17699 −3.29055 −4.07833 −0.17699 −2.57836 −4.35393 −0.17699 −1.79171 −4.56621 −0.17699 −0.9393 −4.69584 −0.17699 −0.03429 −4.72479 −0.17699 0.905962 −4.63858 −0.17699 1.861215 −4.42871 −0.17699 2.810998 −4.09498 −0.17699 3.737497 −3.64501 −0.17699 4.626885 −3.09131 −0.17699 5.46979 −2.44923 −0.17699 6.2612 −1.73549 −0.17699 7.001274 −0.96833 −0.17699 7.691772 −0.16367 −0.17699 8.332183 0.666957 −0.17699 8.924397 1.511698 −0.17699 9.473898 2.357796 −0.17699 9.982047 3.196599 −0.17699 10.44952 4.020653 −0.17699 10.88046 4.82131 −0.17699 11.27686 5.591927 −0.17699 11.63924 6.327288 −0.17699 11.96998 7.021887 −0.17699 12.27026 7.671472 −0.17699 12.54075 8.272695 −0.17699 12.78314 8.822442 −0.17699 12.99809 9.318784 −0.17699 13.18654 9.760438 −0.17699 13.34947 10.1469 −0.17699 13.48794 10.47847 −0.17699 13.60305 10.75636 −0.17699 13.69619 10.98258 −0.17699 13.7684 11.16028 −0.17699 13.79894 11.30026 −0.17699 13.75926 11.39206 −0.17699 13.71379 11.43584 −0.17699 13.67157 11.45963 −0.17699 13.63143 11.47281 −0.17699 13.57673 11.47884 −0.17699 13.49123 11.46176 −0.17699 13.39739 11.37932 −0.17699 13.31297 11.23495 −0.17699 13.20801 11.04926 −0.17699 13.07848 10.82124 −0.17699 12.92302 10.54924 −0.17699 12.74057 10.23235 −0.17699 12.53026 9.870365 −0.17699 12.29148 9.463698 −0.17699 12.02402 9.013294 −0.17699 11.7273 8.521005 −0.17699 11.40143 7.988925 −0.17699 11.04576 7.420241 −0.17699 10.6598 6.818646 −0.17699 10.24435 6.187564 −0.17699 9.799157 5.531618 −0.17699 9.325084 4.855183 −0.17699 8.823 4.163054 −0.17699 8.292622 3.461331 −0.17699 7.733816 2.756509 −0.17699 7.149655 2.052955 −0.17699 6.540128 1.357881 −0.17699 5.903684 0.680488 −0.17699 5.237341 0.032751 −0.17699 4.53758 −0.57019 −0.17699 3.802484 −1.11193 −0.17699 3.034185 −1.57673 −0.17699 2.239078 −1.94798 −0.17699 1.429184 −2.21077 −0.17699 0.621746 −2.35373 −0.17699 −0.16213 −2.37591 −0.17699 −0.90265 −2.28903 −0.17699 −1.58639 −2.11653 −0.17699 −2.20897 −1.88936 −0.17699 −2.77385 −1.64011 −0.17699 −3.28773 −1.39776 −0.17699 −3.75647 −1.18382 −0.17699 −4.18503 −1.01016 −0.17699 −4.57455 −0.88048 −0.17699 −4.92153 −0.79402 −0.17699 −5.22207 −0.74582 −0.17699 −5.47345 −0.72928 −0.17699 −5.67479 −0.73602 −0.17699 −5.82683 −0.76104 −0.17699 −5.93224 −0.7944 −0.17699 −9.54258 −0.71217 −0.0885 −9.58876 −0.74769 −0.0885 −9.64557 −0.81047 −0.0885 −9.70297 −0.92788 −0.0885 −9.72452 −1.10868 −0.0885 −9.68502 −1.34317 −0.0885 −9.5776 −1.61992 −0.0885 −9.40119 −1.9318 −0.0885 −9.1538 −2.2728 −0.0885 −8.83307 −2.63649 −0.0885 −8.43618 −3.01493 −0.0885 −7.96001 −3.39786 −0.0885 −7.40195 −3.77241 −0.0885 −6.76043 −4.12276 −0.0885 −6.03603 −4.43036 −0.0885 −5.23222 −4.67329 −0.0885 −4.3573 −4.8285 −0.0885 −3.42534 −4.87583 −0.0885 −2.45545 −4.7973 −0.0885 −1.47052 −4.58313 −0.0885 −0.4937 −4.23358 −0.0885 0.455359 −3.75816 −0.0885 1.362267 −3.17228 −0.0885 2.218126 −2.49407 −0.0885 3.018843 −1.74233 −0.0885 3.764828 −0.93592 −0.0885 4.458084 −0.09126 −0.0885 5.099352 0.778877 −0.0885 5.691753 1.661735 −0.0885 6.240475 2.54487 −0.0885 6.747345 3.419285 −0.0885 7.214056 4.2769 −0.0885 7.644536 5.109229 −0.0885 8.040847 5.909573 −0.0885 8.403993 6.672414 −0.0885 8.736275 7.392265 −0.0885 9.038622 8.064953 −0.0885 9.311772 8.687055 −0.0885 9.557133 9.255547 −0.0885 9.775304 9.768504 −0.0885 9.967016 10.22472 −0.0885 10.13318 10.62372 −0.0885 10.2747 10.96593 −0.0885 10.39257 11.25263 −0.0885 10.4881 11.48595 −0.0885 10.5626 11.66905 −0.0885 10.59355 11.81342 −0.0885 10.55228 11.90787 −0.0885 10.50507 11.95262 −0.0885 10.46125 11.97658 −0.0885 10.4196 11.98947 −0.0885 10.36302 11.99441 −0.0885 10.27535 11.97414 −0.0885 10.18126 11.88604 −0.0885 10.09633 11.73579 −0.0885 9.988891 11.54368 −0.0885 9.856484 11.30765 −0.0885 9.697833 11.02596 −0.0885 9.511991 10.69754 −0.0885 9.298208 10.32211 −0.0885 9.056047 9.89998 −0.0885 8.785362 9.432058 −0.0885 8.485814 8.920082 −0.0885 8.157597 8.366135 −0.0885 7.800365 7.773255 −0.0885 7.413807 7.145051 −0.0885 6.998851 6.484931 −0.0885 6.555212 5.797567 −0.0885 6.083129 5.087797 −0.0885 5.582899 4.360898 −0.0885 5.054843 3.622573 −0.0885 4.498232 2.879745 −0.0885 3.913231 2.139241 −0.0885 3.299662 1.408715 −0.0885 2.656431 0.697272 −0.0885 1.981378 0.016233 −0.0885 1.270555 −0.61898 −0.0885 0.521936 −1.19165 −0.0885 −0.26235 −1.68546 −0.0885 −1.07561 −2.08441 −0.0885 −1.90712 −2.37121 −0.0885 −2.73965 −2.53293 −0.0885 −3.55088 −2.56848 −0.0885 −4.31949 −2.49202 −0.0885 −5.03038 −2.32561 −0.0885 −5.67618 −2.09697 −0.0885 −6.25726 −1.83544 −0.0885 −6.77917 −1.56777 −0.0885 −7.24898 −1.31531 −0.0885 −7.67307 −1.09282 −0.0885 −8.0556 −0.90927 −0.0885 −8.39775 −0.7696 −0.0885 −8.69843 −0.67541 −0.0885 −8.95473 −0.62486 −0.0885 −9.16305 −0.61161 −0.0885 −9.32169 −0.62514 −0.0885 −9.43173 −0.6553 −0.0885 −12.9761 −0.59091 0 −13.0221 −0.62878 0 −13.0781 −0.6949 0 −13.1334 −0.81662 0 −13.1527 −1.0019 0 −13.112 −1.24176 0 −13.0044 −1.52575 0 −12.8286 −1.84742 0 −12.5825 −2.20124 0 −12.2634 −2.58115 0 −11.8684 −2.97959 0 −11.3932 −3.38578 0 −10.8346 −3.78681 0 −10.1904 −4.16644 0 −9.45915 −4.50341 0 −8.64408 −4.77486 0 −7.75295 −4.95454 0 −6.8003 −5.01662 0 −5.80771 −4.94036 0 −4.80111 −4.71657 0 −3.80632 −4.34645 0 −2.84421 −3.84283 0 −1.93209 −3.21982 0 −1.07713 −2.50071 0 −0.28038 −1.70843 0 0.458773 −0.86183 0 1.142826 0.022377 0 1.77399 0.930397 0 2.356692 1.848855 0 2.895678 2.765885 0 3.393213 3.672324 0 3.852012 4.55962 0 4.276073 5.419398 0 4.666768 6.245336 0 5.025434 7.031757 0 5.354332 7.773206 0 5.654287 8.465537 0 5.926101 9.105279 0 6.170877 9.689534 0 6.389122 10.2164 0 6.581351 10.68475 0 6.748382 11.09418 0 6.890922 11.4452 0 7.009876 11.73917 0 7.106429 11.97835 0 7.182137 12.16589 0 7.212787 12.3138 0 7.170519 12.41041 0 7.122144 12.45611 0 7.077119 12.48026 0 7.034255 12.49283 0 6.976203 12.49661 0 6.887113 12.47291 0 6.793961 12.37932 0 6.709554 12.22397 0 6.60113 12.02625 0 6.467687 11.78323 0 6.308056 11.49303 0 6.121415 11.15449 0 5.907151 10.76722 0 5.665 10.33142 0 5.394887 9.847968 0 5.096725 9.318473 0 4.770802 8.74499 0 4.417087 8.130399 0 4.03543 7.478222 0 3.626444 6.792097 0 3.18995 6.076634 0 2.726055 5.33677 0 2.23529 4.577624 0 1.716353 3.805967 0 1.168802 3.028523 0 0.592508 2.25231 0 −0.01431 1.486174 0 −0.65349 0.739914 0 −1.32635 0.024112 0 −2.03815 −0.64463 0 −2.79155 −1.24867 0 −3.58469 −1.77066 0 −4.41014 −2.19472 0 −5.25629 −2.5055 0 −6.1066 −2.69039 0 −6.93936 −2.74469 0 −7.73132 −2.67891 0 −8.46428 −2.51513 0 −9.12885 −2.28317 0 −9.72349 −2.01159 0 −10.2526 −1.72644 0 −10.7233 −1.44884 0 −11.1426 −1.19422 0 −11.5149 −0.9717 0 −11.8441 −0.78831 0 −12.1319 −0.64743 0 −12.3798 −0.55231 0 −12.5871 −0.50492 0 −12.75 −0.50325 0 −12.8636 −0.53079 0 −16.2281 −0.49077 0.088496 −16.2736 −0.53091 0.088496 −16.3283 −0.60013 0.088496 −16.3811 −0.72559 0.088496 −16.3979 −0.91447 0.088496 −16.3564 −1.15864 0.088496 −16.2491 −1.44862 0.088496 −16.0749 −1.77861 0.088496 −15.8312 −2.14353 0.088496 −15.5153 −2.53758 0.088496 −15.1235 −2.95312 0.088496 −14.6523 −3.3809 0.088496 −14.0964 −3.80634 0.088496 −13.452 −4.21171 0.088496 −12.7176 −4.5758 0.088496 −11.8943 −4.87069 0.088496 −10.9904 −5.06949 0.088496 −10.0212 −5.1415 0.088496 −9.01077 −5.06309 0.088496 −7.9886 −4.82391 0.088496 −6.9838 −4.42643 0.088496 −6.01961 −3.88555 0.088496 −5.109 −3.22573 0.088496 −4.25737 −2.4719 0.088496 −3.46822 −1.64379 0.088496 −2.73988 −0.76141 0.088496 −2.06867 0.157688 0.088496 −1.4508 1.098772 0.088496 −0.88071 2.048073 0.088496 −0.35416 2.994321 0.088496 0.131669 3.928168 0.088496 0.580375 4.840737 0.088496 0.994739 5.724368 0.088496 1.377007 6.572354 0.088496 1.729014 7.37882 0.088496 2.05283 8.138434 0.088496 2.348929 8.847198 0.088496 2.618151 9.501616 0.088496 2.861245 10.09893 0.088496 3.078605 10.63727 0.088496 3.270516 11.11561 0.088496 3.437694 11.53358 0.088496 3.580644 11.8918 0.088496 3.700167 12.19171 0.088496 3.797337 12.43566 0.088496 3.873895 12.62678 0.088496 3.903782 12.77763 0.088496 3.860549 12.87589 0.088496 3.811265 12.92237 0.088496 3.765283 12.94669 0.088496 3.721533 12.95896 0.088496 3.662411 12.96164 0.088496 3.572549 12.93485 0.088496 3.480509 12.83699 0.088496 3.397026 12.67768 0.088496 3.288368 12.47565 0.088496 3.154806 12.22725 0.088496 2.995288 11.93048 0.088496 2.809117 11.58409 0.088496 2.595825 11.18758 0.088496 2.355333 10.74105 0.088496 2.087646 10.24536 0.088496 1.792936 9.701971 0.088496 1.471604 9.112897 0.088496 1.123954 8.480841 0.088496 0.750049 7.809214 0.088496 0.349922 7.101995 0.088496 −0.07658 6.363768 0.088496 −0.52906 5.599291 0.088496 −1.00773 4.814118 0.088496 −1.51427 4.015188 0.088496 −2.04916 3.209195 0.088496 −2.61405 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3.602839 1.035398 −9.67845 3.731738 1.035398 −10.5325 3.831059 1.035398 −11.3654 3.867076 1.035398 −12.1709 3.82265 1.035398 −12.9366 3.692987 1.035398 −13.6495 3.48744 1.035398 −14.2997 3.220694 1.035398 −14.8808 2.908335 1.035398 −15.3892 2.565466 1.035398 −15.8238 2.206099 1.035398 −16.1852 1.842749 1.035398 −16.4758 1.487145 1.035398 −16.7015 1.150504 1.035398 −16.8704 0.842089 1.035398 −16.9922 0.569213 1.035398 −17.0764 0.33639 1.035398 −17.1309 0.146911 1.035398 −17.1626 7.33E−05 1.035398 −17.1783 −0.1064 1.035398 −17.6984 −0.16988 1.061947 −17.6979 −0.24207 1.061947 −17.6976 −0.34472 1.061947 −17.7018 −0.49228 1.061947 −17.7175 −0.68735 1.061947 −17.7042 −0.93683 1.061947 −17.6524 −1.24748 1.061947 −17.5462 −1.61799 1.061947 −17.3691 −2.04024 1.061947 −17.1086 −2.50008 1.061947 −16.7574 −2.98362 1.061947 −16.3137 −3.47892 1.061947 −15.7756 −3.9752 1.061947 −15.1391 −4.4537 1.061947 −14.4001 −4.88454 1.061947 −13.5604 −5.23596 1.061947 −12.6284 −5.48016 1.061947 −11.6214 −5.60413 1.061947 −10.562 −5.60837 1.061947 −9.46962 −5.4969 1.061947 −8.36271 −5.26992 1.061947 −7.26399 −4.91166 1.061947 −6.20283 −4.409 1.061947 −5.20611 −3.76273 1.061947 −4.29264 −2.99168 1.061947 −3.47614 −2.11846 1.061947 −2.75319 −1.17418 1.061947 −2.1155 −0.18542 1.061947 −1.55215 0.825561 1.061947 −1.05133 1.840537 1.061947 −0.60253 2.845055 1.061947 −0.19719 3.827563 1.061947 0.16907 4.779568 1.061947 0.501695 5.693057 1.061947 0.805098 6.561244 1.061947 1.081503 7.378826 1.061947 1.334422 8.140762 1.061947 1.563626 8.843933 1.061947 1.769554 9.485713 1.061947 1.954692 10.06356 1.061947 2.118994 10.57657 1.061947 2.262555 11.02462 1.061947 2.385907 11.40839 1.061947 2.489467 11.72954 1.061947 2.573469 11.99081 1.061947 2.635429 12.19695 1.061947 2.64918 12.35614 1.061947 2.616168 12.46337 1.061947 2.576969 12.52273 1.061947 2.536505 12.55898 1.061947 2.498402 12.5776 1.061947 2.444529 12.58742 1.061947 2.359334 12.56549 1.061947 2.271859 12.4755 1.061947 2.201308 12.32471 1.061947 2.120214 12.12703 1.061947 2.018818 11.88466 1.061947 1.894155 11.59663 1.061947 1.741755 11.26351 1.061947 1.556687 10.88714 1.061947 1.334209 10.47036 1.061947 1.071116 10.0163 1.061947 0.765788 9.528073 1.061947 0.41772 9.008884 1.061947 0.027244 8.462019 1.061947 −0.40494 7.89109 1.061947 −0.87786 7.300073 1.061947 −1.39223 6.69491 1.061947 −1.95064 6.084095 1.061947 −2.55991 5.481696 1.061947 −3.23454 4.914938 1.061947 −3.98944 4.427664 1.061947 −4.82023 4.060552 1.061947 −5.70847 3.843353 1.061947 −6.6241 3.77954 1.061947 −7.54858 3.842532 1.061947 −8.46277 3.980712 1.061947 −9.36195 4.140256 1.061947 −10.2431 4.273356 1.061947 −11.1063 4.346435 1.061947 −11.9489 4.336282 1.061947 −12.7601 4.233538 1.061947 −13.5254 4.042562 1.061947 −14.2316 3.777572 1.061947 −14.87 3.457088 1.061947 −15.4367 3.099763 1.061947 −15.9307 2.721971 1.061947 −16.3529 2.336659 1.061947 −16.7041 1.954309 1.061947 −16.9868 1.58445 1.061947 −17.2055 1.236711 1.061947 −17.369 0.919929 1.061947 −17.488 0.641205 1.061947 −17.5727 0.404717 1.061947 −17.6303 0.214567 1.061947 −17.6655 0.072921 1.061947 −17.6853 −0.03172 1.061947 −17.6952 −0.11264 1.061947

In the above Table 1, the plane Zadim=0 corresponds to the reference plane P0 situated at the base of the profile. This plane P0 is the intersection of the stacking axis AE of the set of vanes with the axisymmetric surface of the hub, i.e. it passes via the intersection between the axis AE and the surface 16A where it is assembled with the inner shroud 16. The plane Zadim=1 corresponds to the reference plane P1 situated at the top of the profile. This plane P1 is the intersection between the axis AE and the axisymmetric surface of the casing, i.e. it passes via the intersection of the axis AE with the surface 12A where it is assembled with the outer ring 12.

By convention, the stacking axis AE of the set of vanes, for the vane of a nozzle, is the axis that extends in the radial direction Z and passes through the middle of the inter-vane throat. For a given vane, the inter-vane throat is the location where the distance between the trailing edge of the vane in question and the suction side of the preceding vane in the direction of rotation of the turbine is at a minimum.

This is the axis on which the various X,Y sections of the set of vanes are “stacked” when designing the set of vanes.

As mentioned at the beginning of the present description, the aerodynamic profile of the invention is substantially identical to the nominal profile defined in the above table, i.e. it departs from said nominal profile by very little at most, being defined in particular within an envelope of ±1 mm in a direction normal to the surface of the nominal profile, and/or having X,Y coordinates lying within a range of ±5% relative to the coordinates X,Y of the nominal profile.

The coordinate Zadim is non-dimensional, i.e. for a point P, situated at a distance D from the plane P0 (where D is measured along the axis Z), the value of Zadim is D/H, where H represents the total height of the profile as measured between the planes P0 and P1. Naturally, in the Table 1 above, by multiplying the coordinate Zadim by the height H, it is possible to obtain the complete coordinates of the vane.

By way of example, the total height H is preferably about 100 mm±10%. By way of example, the plane P0 is situated at a distance of about 385 mm±10% from the axis A.

In the above table, the profile is characterized by twenty-one section planes at constant Zadim coordinates, for which the coordinates X and Y are specified. These twenty-one section planes include seventeen section planes located between Zadim=0 and Zadim=1, and thus arranged in the fluid stream, these section planes being distributed from P0 to P1. The twenty-one section planes also include four section planes which are substantially outside the fluid stream (two section planes with Zadim<0, and two section planes with Zadim>1), these four section planes being provided for ensuring geometric continuity of the stacking, close to the head and the foot, respectively. In each section plane at constant coordinate Zadim, the section of the profile is given by a continuous and smooth curve, interconnecting all of the points (X,Y). In each section plane, the profile is interpolated so as to generate a uniform profile. Between the section planes, the profile is to be interpolated so as to generate a complete vane, as homogeneous as possible.

It is advantageous for the nozzle that includes the vane of the invention to have 140 to 160 vanes that present aerodynamic profiles as defined above. 

We claim:
 1. An aerodynamic profile for a turbine vane, the profile being, when cold and in a non-coated state, substantially identical to a nominal profile determined by the Cartesian coordinates X,Y,Zadim given in Table 1, in which the coordinate Zadim is the quotient D/H, where D is the distance of the point under consideration from a reference X,Y plane situated at the base of the nominal profile, and H is the height of said profile measured from said reference plane out to the end of the vane, the measurements D and H being taken radially relative to the axis of the turbine, while the coordinate X is measured in the axial direction of the turbine.
 2. The aerodynamic profile as claimed in claim 1, wherein said profile is defined within an envelope of ±1 mm in a direction normal to the surface of the nominal profile.
 3. The aerodynamic profile as claimed in claim 1, wherein the coordinates X,Y of said profile lie within a range of ±5% relative to the coordinates X,Y of the nominal profile.
 4. The aerodynamic profile as claimed in claim 1, wherein the vane is a nozzle vane forming a part of a stator of a turbine.
 5. The aerodynamic profile as claimed in claim 4, wherein the vane is a nozzle vane of the third stage of the turbine.
 6. The aerodynamic profile as claimed in claim 4, wherein the vane is a vane of the third stage nozzle of a turbine having seven stages.
 7. A turbine vane, presenting an aerodynamic profile as claimed in claim
 1. 8. A turbine, including turbine vanes presenting aerodynamic profiles as claimed in claim
 1. 9. A turbine as claimed in claim 8, including a nozzle that is stationary in rotation, having 140 to 160 vanes that present aerodynamic profiles comprising: when cold and in a non-coated state, substantially identical to a nominal profile determined by the Cartesian coordinates X,Y,Zadim given in Table 1, in which the coordinate Zadim is the quotient D/H, where D is the distance of the point under consideration from a reference X,Y plane situated at the base of the nominal profile, and H is the height of said profile measured from said reference plane out to the end of the vane, the measurements D and H being taken radially relative to the axis of the turbine, while the coordinate X is measured in the axial direction of the turbine.
 10. A turbine nozzle forming a portion of a turbine stator, wherein all the vanes of the nozzle present an aerodynamic profile as claimed in claim
 1. 11. A turbine nozzle as claimed in claim 10, including 140 to 160 vanes that present aerodynamic profiles comprising: when cold and in a non-coated state, substantially identical to a nominal profile determined by the Cartesian coordinates X,Y,Zadim given in Table 1, in which the coordinate Zadim is the quotient D/H, where D is the distance of the point under consideration from a reference X,Y plane situated at the base of the nominal profile, and H is the height of said profile measured from said reference plane out to the end of the vane, the measurements D and H being taken radially relative to the axis of the turbine, while the coordinate X is measured in the axial direction of the turbine. 